-use std::borrow::Cow;
+//! Handling of `static`s, `const`s and promoted allocations
-use rustc_span::DUMMY_SP;
-
-use rustc::mir::interpret::{
- read_target_uint, AllocId, Allocation, ConstValue, GlobalAlloc, InterpResult, Scalar,
-};
-use rustc::ty::{layout::Align, Const, ConstKind};
-use rustc_mir::interpret::{
- ImmTy, InterpCx, Machine, Memory, MemoryKind, OpTy, PanicInfo, PlaceTy, Pointer,
- StackPopCleanup, StackPopInfo,
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_errors::ErrorReported;
+use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
+use rustc_middle::mir::interpret::{
+ read_target_uint, AllocId, Allocation, ConstValue, ErrorHandled, GlobalAlloc, Scalar,
};
+use rustc_middle::ty::ConstKind;
+use rustc_span::DUMMY_SP;
+use cranelift_codegen::ir::GlobalValueData;
use cranelift_module::*;
use crate::prelude::*;
-#[derive(Default)]
-pub struct ConstantCx {
- todo: HashSet<TodoItem>,
- done: HashSet<DataId>,
+pub(crate) struct ConstantCx {
+ todo: Vec<TodoItem>,
+ done: FxHashSet<DataId>,
+ anon_allocs: FxHashMap<AllocId, DataId>,
}
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+#[derive(Copy, Clone, Debug)]
enum TodoItem {
Alloc(AllocId),
Static(DefId),
}
impl ConstantCx {
- pub fn finalize(mut self, tcx: TyCtxt<'_>, module: &mut Module<impl Backend>) {
+ pub(crate) fn new() -> Self {
+ ConstantCx { todo: vec![], done: FxHashSet::default(), anon_allocs: FxHashMap::default() }
+ }
+
+ pub(crate) fn finalize(mut self, tcx: TyCtxt<'_>, module: &mut dyn Module) {
//println!("todo {:?}", self.todo);
define_all_allocs(tcx, module, &mut self);
//println!("done {:?}", self.done);
}
}
-pub fn codegen_static(constants_cx: &mut ConstantCx, def_id: DefId) {
- constants_cx.todo.insert(TodoItem::Static(def_id));
+pub(crate) fn check_constants(fx: &mut FunctionCx<'_, '_, '_>) -> bool {
+ let mut all_constants_ok = true;
+ for constant in &fx.mir.required_consts {
+ let const_ = match fx.monomorphize(constant.literal) {
+ ConstantKind::Ty(ct) => ct,
+ ConstantKind::Val(..) => continue,
+ };
+ match const_.val {
+ ConstKind::Value(_) => {}
+ ConstKind::Unevaluated(unevaluated) => {
+ if let Err(err) =
+ fx.tcx.const_eval_resolve(ParamEnv::reveal_all(), unevaluated, None)
+ {
+ all_constants_ok = false;
+ match err {
+ ErrorHandled::Reported(ErrorReported) | ErrorHandled::Linted => {
+ fx.tcx.sess.span_err(constant.span, "erroneous constant encountered");
+ }
+ ErrorHandled::TooGeneric => {
+ span_bug!(
+ constant.span,
+ "codgen encountered polymorphic constant: {:?}",
+ err
+ );
+ }
+ }
+ }
+ }
+ ConstKind::Param(_)
+ | ConstKind::Infer(_)
+ | ConstKind::Bound(_, _)
+ | ConstKind::Placeholder(_)
+ | ConstKind::Error(_) => unreachable!("{:?}", const_),
+ }
+ }
+ all_constants_ok
+}
+
+pub(crate) fn codegen_static(tcx: TyCtxt<'_>, module: &mut dyn Module, def_id: DefId) {
+ let mut constants_cx = ConstantCx::new();
+ constants_cx.todo.push(TodoItem::Static(def_id));
+ constants_cx.finalize(tcx, module);
}
-pub fn codegen_static_ref<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+pub(crate) fn codegen_tls_ref<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
def_id: DefId,
- ty: Ty<'tcx>,
-) -> CPlace<'tcx> {
- let linkage = crate::linkage::get_static_ref_linkage(fx.tcx, def_id);
- let data_id = data_id_for_static(fx.tcx, fx.module, def_id, linkage);
- cplace_for_dataid(fx, ty, data_id)
+ layout: TyAndLayout<'tcx>,
+) -> CValue<'tcx> {
+ let data_id = data_id_for_static(fx.tcx, fx.module, def_id, false);
+ let local_data_id = fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
+ if fx.clif_comments.enabled() {
+ fx.add_comment(local_data_id, format!("tls {:?}", def_id));
+ }
+ let tls_ptr = fx.bcx.ins().tls_value(fx.pointer_type, local_data_id);
+ CValue::by_val(tls_ptr, layout)
}
-pub fn trans_promoted<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- instance: Instance<'tcx>,
- promoted: Promoted,
- dest_ty: Ty<'tcx>,
+fn codegen_static_ref<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ def_id: DefId,
+ layout: TyAndLayout<'tcx>,
) -> CPlace<'tcx> {
- match fx.tcx.const_eval_promoted(instance, promoted) {
- Ok(const_) => {
- let cplace = trans_const_place(fx, const_);
- debug_assert_eq!(cplace.layout(), fx.layout_of(dest_ty));
- cplace
- }
- Err(_) => crate::trap::trap_unreachable_ret_place(
- fx,
- fx.layout_of(dest_ty),
- "[panic] Tried to get value of promoted value with errored during const eval.",
- ),
+ let data_id = data_id_for_static(fx.tcx, fx.module, def_id, false);
+ let local_data_id = fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
+ if fx.clif_comments.enabled() {
+ fx.add_comment(local_data_id, format!("{:?}", def_id));
}
+ let global_ptr = fx.bcx.ins().global_value(fx.pointer_type, local_data_id);
+ assert!(!layout.is_unsized(), "unsized statics aren't supported");
+ assert!(
+ matches!(
+ fx.bcx.func.global_values[local_data_id],
+ GlobalValueData::Symbol { tls: false, .. }
+ ),
+ "tls static referenced without Rvalue::ThreadLocalRef"
+ );
+ CPlace::for_ptr(crate::pointer::Pointer::new(global_ptr), layout)
}
-pub fn trans_constant<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+pub(crate) fn codegen_constant<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
constant: &Constant<'tcx>,
) -> CValue<'tcx> {
- let const_ = force_eval_const(fx, &constant.literal);
- trans_const_value(fx, const_)
-}
-
-pub fn force_eval_const<'tcx>(
- fx: &FunctionCx<'_, 'tcx, impl Backend>,
- const_: &'tcx Const,
-) -> &'tcx Const<'tcx> {
- match const_.val {
- ConstKind::Unevaluated(def_id, ref substs) => {
- let substs = fx.monomorphize(substs);
- fx.tcx.const_eval_resolve(ParamEnv::reveal_all(), def_id, substs, None).unwrap()
+ let const_ = match fx.monomorphize(constant.literal) {
+ ConstantKind::Ty(ct) => ct,
+ ConstantKind::Val(val, ty) => return codegen_const_value(fx, val, ty),
+ };
+ let const_val = match const_.val {
+ ConstKind::Value(const_val) => const_val,
+ ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted })
+ if fx.tcx.is_static(def.did) =>
+ {
+ assert!(substs.is_empty());
+ assert!(promoted.is_none());
+
+ return codegen_static_ref(fx, def.did, fx.layout_of(const_.ty)).to_cvalue(fx);
}
- _ => fx.monomorphize(&const_),
- }
+ ConstKind::Unevaluated(unevaluated) => {
+ match fx.tcx.const_eval_resolve(ParamEnv::reveal_all(), unevaluated, None) {
+ Ok(const_val) => const_val,
+ Err(_) => {
+ span_bug!(constant.span, "erroneous constant not captured by required_consts");
+ }
+ }
+ }
+ ConstKind::Param(_)
+ | ConstKind::Infer(_)
+ | ConstKind::Bound(_, _)
+ | ConstKind::Placeholder(_)
+ | ConstKind::Error(_) => unreachable!("{:?}", const_),
+ };
+
+ codegen_const_value(fx, const_val, const_.ty)
}
-pub fn trans_const_value<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- const_: &'tcx Const<'tcx>,
+pub(crate) fn codegen_const_value<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ const_val: ConstValue<'tcx>,
+ ty: Ty<'tcx>,
) -> CValue<'tcx> {
- let ty = fx.monomorphize(&const_.ty);
let layout = fx.layout_of(ty);
- match ty.kind {
- ty::Bool | ty::Uint(_) => {
- let bits = const_.val.try_to_bits(layout.size).unwrap();
- CValue::const_val(fx, ty, bits)
- }
- ty::Int(_) => {
- let bits = const_.val.try_to_bits(layout.size).unwrap();
- CValue::const_val(
- fx,
- ty,
- rustc::mir::interpret::sign_extend(bits, layout.size),
- )
- }
- ty::Float(fty) => {
- let bits = const_.val.try_to_bits(layout.size).unwrap();
- let val = match fty {
- FloatTy::F32 => fx
- .bcx
- .ins()
- .f32const(Ieee32::with_bits(u32::try_from(bits).unwrap())),
- FloatTy::F64 => fx
- .bcx
- .ins()
- .f64const(Ieee64::with_bits(u64::try_from(bits).unwrap())),
- };
- CValue::by_val(val, layout)
- }
- ty::FnDef(_def_id, _substs) => CValue::by_ref(
- crate::pointer::Pointer::const_addr(fx, fx.pointer_type.bytes() as i64),
+ assert!(!layout.is_unsized(), "sized const value");
+
+ if layout.is_zst() {
+ return CValue::by_ref(crate::Pointer::dangling(layout.align.pref), layout);
+ }
+
+ match const_val {
+ ConstValue::Scalar(x) => match x {
+ Scalar::Int(int) => {
+ if fx.clif_type(layout.ty).is_some() {
+ return CValue::const_val(fx, layout, int);
+ } else {
+ let raw_val = int.to_bits(int.size()).unwrap();
+ let val = match int.size().bytes() {
+ 1 => fx.bcx.ins().iconst(types::I8, raw_val as i64),
+ 2 => fx.bcx.ins().iconst(types::I16, raw_val as i64),
+ 4 => fx.bcx.ins().iconst(types::I32, raw_val as i64),
+ 8 => fx.bcx.ins().iconst(types::I64, raw_val as i64),
+ 16 => {
+ let lsb = fx.bcx.ins().iconst(types::I64, raw_val as u64 as i64);
+ let msb =
+ fx.bcx.ins().iconst(types::I64, (raw_val >> 64) as u64 as i64);
+ fx.bcx.ins().iconcat(lsb, msb)
+ }
+ _ => unreachable!(),
+ };
+
+ let place = CPlace::new_stack_slot(fx, layout);
+ place.to_ptr().store(fx, val, MemFlags::trusted());
+ place.to_cvalue(fx)
+ }
+ }
+ Scalar::Ptr(ptr) => {
+ let alloc_kind = fx.tcx.get_global_alloc(ptr.alloc_id);
+ let base_addr = match alloc_kind {
+ Some(GlobalAlloc::Memory(alloc)) => {
+ let data_id = data_id_for_alloc_id(
+ &mut fx.constants_cx,
+ fx.module,
+ ptr.alloc_id,
+ alloc.mutability,
+ );
+ let local_data_id =
+ fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
+ if fx.clif_comments.enabled() {
+ fx.add_comment(local_data_id, format!("{:?}", ptr.alloc_id));
+ }
+ fx.bcx.ins().global_value(fx.pointer_type, local_data_id)
+ }
+ Some(GlobalAlloc::Function(instance)) => {
+ let func_id = crate::abi::import_function(fx.tcx, fx.module, instance);
+ let local_func_id =
+ fx.module.declare_func_in_func(func_id, &mut fx.bcx.func);
+ fx.bcx.ins().func_addr(fx.pointer_type, local_func_id)
+ }
+ Some(GlobalAlloc::Static(def_id)) => {
+ assert!(fx.tcx.is_static(def_id));
+ let data_id = data_id_for_static(fx.tcx, fx.module, def_id, false);
+ let local_data_id =
+ fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
+ if fx.clif_comments.enabled() {
+ fx.add_comment(local_data_id, format!("{:?}", def_id));
+ }
+ fx.bcx.ins().global_value(fx.pointer_type, local_data_id)
+ }
+ None => bug!("missing allocation {:?}", ptr.alloc_id),
+ };
+ let val = if ptr.offset.bytes() != 0 {
+ fx.bcx.ins().iadd_imm(base_addr, i64::try_from(ptr.offset.bytes()).unwrap())
+ } else {
+ base_addr
+ };
+ CValue::by_val(val, layout)
+ }
+ },
+ ConstValue::ByRef { alloc, offset } => CValue::by_ref(
+ pointer_for_allocation(fx, alloc)
+ .offset_i64(fx, i64::try_from(offset.bytes()).unwrap()),
layout,
),
- _ => trans_const_place(fx, const_).to_cvalue(fx),
+ ConstValue::Slice { data, start, end } => {
+ let ptr = pointer_for_allocation(fx, data)
+ .offset_i64(fx, i64::try_from(start).unwrap())
+ .get_addr(fx);
+ let len = fx
+ .bcx
+ .ins()
+ .iconst(fx.pointer_type, i64::try_from(end.checked_sub(start).unwrap()).unwrap());
+ CValue::by_val_pair(ptr, len, layout)
+ }
}
}
-fn trans_const_place<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- const_: &'tcx Const<'tcx>,
-) -> CPlace<'tcx> {
- // Adapted from https://github.com/rust-lang/rust/pull/53671/files#diff-e0b58bb6712edaa8595ad7237542c958L551
- let result = || -> InterpResult<'tcx, &'tcx Allocation> {
- let mut ecx = InterpCx::new(
- fx.tcx.at(DUMMY_SP),
- ty::ParamEnv::reveal_all(),
- TransPlaceInterpreter,
- (),
- );
- ecx.push_stack_frame(
- fx.instance,
- DUMMY_SP,
- fx.mir,
- None,
- StackPopCleanup::None { cleanup: false },
- )
- .unwrap();
- let op = ecx.eval_operand(
- &Operand::Constant(Box::new(Constant {
- span: DUMMY_SP,
- user_ty: None,
- literal: const_,
- })),
- None,
- )?;
- let ptr = ecx.allocate(op.layout, MemoryKind::Stack);
- ecx.copy_op(op, ptr.into())?;
- let alloc = ecx
- .memory
- .get_raw(ptr.to_ref().to_scalar()?.assert_ptr().alloc_id)?;
- Ok(fx.tcx.intern_const_alloc(alloc.clone()))
- };
- let alloc = result().expect("unable to convert ConstKind to Allocation");
+pub(crate) fn pointer_for_allocation<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ alloc: &'tcx Allocation,
+) -> crate::pointer::Pointer {
+ let alloc_id = fx.tcx.create_memory_alloc(alloc);
+ let data_id =
+ data_id_for_alloc_id(&mut fx.constants_cx, &mut *fx.module, alloc_id, alloc.mutability);
- //println!("const value: {:?} allocation: {:?}", value, alloc);
- let alloc_id = fx.tcx.alloc_map.lock().create_memory_alloc(alloc);
- fx.constants_cx.todo.insert(TodoItem::Alloc(alloc_id));
- let data_id = data_id_for_alloc_id(fx.module, alloc_id, alloc.align);
- cplace_for_dataid(fx, const_.ty, data_id)
+ let local_data_id = fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
+ if fx.clif_comments.enabled() {
+ fx.add_comment(local_data_id, format!("{:?}", alloc_id));
+ }
+ let global_ptr = fx.bcx.ins().global_value(fx.pointer_type, local_data_id);
+ crate::pointer::Pointer::new(global_ptr)
}
-fn data_id_for_alloc_id<B: Backend>(
- module: &mut Module<B>,
+pub(crate) fn data_id_for_alloc_id(
+ cx: &mut ConstantCx,
+ module: &mut dyn Module,
alloc_id: AllocId,
- align: Align,
+ mutability: rustc_hir::Mutability,
) -> DataId {
- module
- .declare_data(
- &format!("__alloc_{}", alloc_id.0),
- Linkage::Local,
- false,
- Some(align.bytes() as u8),
- )
- .unwrap()
+ cx.todo.push(TodoItem::Alloc(alloc_id));
+ *cx.anon_allocs.entry(alloc_id).or_insert_with(|| {
+ module.declare_anonymous_data(mutability == rustc_hir::Mutability::Mut, false).unwrap()
+ })
}
fn data_id_for_static(
tcx: TyCtxt<'_>,
- module: &mut Module<impl Backend>,
+ module: &mut dyn Module,
def_id: DefId,
- linkage: Linkage,
+ definition: bool,
) -> DataId {
- let instance = Instance::mono(tcx, def_id);
- let symbol_name = tcx.symbol_name(instance).name.as_str();
- let ty = instance.ty(tcx);
+ let rlinkage = tcx.codegen_fn_attrs(def_id).linkage;
+ let linkage = if definition {
+ crate::linkage::get_static_linkage(tcx, def_id)
+ } else if rlinkage == Some(rustc_middle::mir::mono::Linkage::ExternalWeak)
+ || rlinkage == Some(rustc_middle::mir::mono::Linkage::WeakAny)
+ {
+ Linkage::Preemptible
+ } else {
+ Linkage::Import
+ };
+
+ let instance = Instance::mono(tcx, def_id).polymorphize(tcx);
+ let symbol_name = tcx.symbol_name(instance).name;
+ let ty = instance.ty(tcx, ParamEnv::reveal_all());
let is_mutable = if tcx.is_mutable_static(def_id) {
true
} else {
- !ty.is_freeze(tcx, ParamEnv::reveal_all(), DUMMY_SP)
+ !ty.is_freeze(tcx.at(DUMMY_SP), ParamEnv::reveal_all())
};
- let align = tcx
- .layout_of(ParamEnv::reveal_all().and(ty))
- .unwrap()
- .align
- .pref
- .bytes();
+ let align = tcx.layout_of(ParamEnv::reveal_all().and(ty)).unwrap().align.pref.bytes();
+
+ let attrs = tcx.codegen_fn_attrs(def_id);
let data_id = module
.declare_data(
&*symbol_name,
linkage,
is_mutable,
- Some(align.try_into().unwrap()),
+ attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL),
)
.unwrap();
- if linkage == Linkage::Preemptible {
- if let ty::RawPtr(_) = ty.kind {
- } else {
- tcx.sess.span_fatal(
- tcx.def_span(def_id),
- "must have type `*const T` or `*mut T` due to `#[linkage]` attribute",
- )
- }
-
+ if rlinkage.is_some() {
+ // Comment copied from https://github.com/rust-lang/rust/blob/45060c2a66dfd667f88bd8b94261b28a58d85bd5/src/librustc_codegen_llvm/consts.rs#L141
+ // Declare an internal global `extern_with_linkage_foo` which
+ // is initialized with the address of `foo`. If `foo` is
+ // discarded during linking (for example, if `foo` has weak
+ // linkage and there are no definitions), then
+ // `extern_with_linkage_foo` will instead be initialized to
+ // zero.
+
+ let ref_name = format!("_rust_extern_with_linkage_{}", symbol_name);
+ let ref_data_id = module.declare_data(&ref_name, Linkage::Local, false, false).unwrap();
let mut data_ctx = DataContext::new();
- let zero_bytes = std::iter::repeat(0)
- .take(pointer_ty(tcx).bytes() as usize)
- .collect::<Vec<u8>>()
- .into_boxed_slice();
- data_ctx.define(zero_bytes);
- match module.define_data(data_id, &data_ctx) {
- // Everytime a weak static is referenced, there will be a zero pointer definition,
+ data_ctx.set_align(align);
+ let data = module.declare_data_in_data(data_id, &mut data_ctx);
+ data_ctx.define(std::iter::repeat(0).take(pointer_ty(tcx).bytes() as usize).collect());
+ data_ctx.write_data_addr(0, data, 0);
+ match module.define_data(ref_data_id, &data_ctx) {
+ // Every time the static is referenced there will be another definition of this global,
// so duplicate definitions are expected and allowed.
Err(ModuleError::DuplicateDefinition(_)) => {}
res => res.unwrap(),
}
+ ref_data_id
+ } else {
+ data_id
}
-
- data_id
}
-fn cplace_for_dataid<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- ty: Ty<'tcx>,
- data_id: DataId,
-) -> CPlace<'tcx> {
- let local_data_id = fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
- let global_ptr = fx.bcx.ins().global_value(fx.pointer_type, local_data_id);
- let layout = fx.layout_of(fx.monomorphize(&ty));
- assert!(!layout.is_unsized(), "unsized statics aren't supported");
- CPlace::for_ptr(crate::pointer::Pointer::new(global_ptr), layout)
-}
-
-fn define_all_allocs(tcx: TyCtxt<'_>, module: &mut Module<impl Backend>, cx: &mut ConstantCx) {
- let memory = Memory::<TransPlaceInterpreter>::new(tcx.at(DUMMY_SP), ());
-
- while let Some(todo_item) = pop_set(&mut cx.todo) {
- let (data_id, alloc) = match todo_item {
+fn define_all_allocs(tcx: TyCtxt<'_>, module: &mut dyn Module, cx: &mut ConstantCx) {
+ while let Some(todo_item) = cx.todo.pop() {
+ let (data_id, alloc, section_name) = match todo_item {
TodoItem::Alloc(alloc_id) => {
//println!("alloc_id {}", alloc_id);
- let alloc = memory.get_raw(alloc_id).unwrap();
- let data_id = data_id_for_alloc_id(module, alloc_id, alloc.align);
- (data_id, alloc)
+ let alloc = match tcx.get_global_alloc(alloc_id).unwrap() {
+ GlobalAlloc::Memory(alloc) => alloc,
+ GlobalAlloc::Function(_) | GlobalAlloc::Static(_) => unreachable!(),
+ };
+ let data_id = *cx.anon_allocs.entry(alloc_id).or_insert_with(|| {
+ module
+ .declare_anonymous_data(
+ alloc.mutability == rustc_hir::Mutability::Mut,
+ false,
+ )
+ .unwrap()
+ });
+ (data_id, alloc, None)
}
TodoItem::Static(def_id) => {
//println!("static {:?}", def_id);
- if tcx.is_foreign_item(def_id) {
- continue;
- }
-
- let const_ = tcx.const_eval_poly(def_id).unwrap();
+ let section_name = tcx.codegen_fn_attrs(def_id).link_section.map(|s| s.as_str());
- let alloc = match const_.val {
- ConstKind::Value(ConstValue::ByRef { alloc, offset }) if offset.bytes() == 0 => alloc,
- _ => bug!("static const eval returned {:#?}", const_),
- };
+ let alloc = tcx.eval_static_initializer(def_id).unwrap();
- let data_id = data_id_for_static(
- tcx,
- module,
- def_id,
- if tcx.is_reachable_non_generic(def_id) {
- Linkage::Export
- } else {
- Linkage::Local
- },
- );
- (data_id, alloc)
+ let data_id = data_id_for_static(tcx, module, def_id, true);
+ (data_id, alloc, section_name)
}
};
}
let mut data_ctx = DataContext::new();
+ data_ctx.set_align(alloc.align.bytes());
+
+ if let Some(section_name) = section_name {
+ let (segment_name, section_name) = if tcx.sess.target.is_like_osx {
+ if let Some(names) = section_name.split_once(',') {
+ names
+ } else {
+ tcx.sess.fatal(&format!(
+ "#[link_section = \"{}\"] is not valid for macos target: must be segment and section separated by comma",
+ section_name
+ ));
+ }
+ } else {
+ ("", &*section_name)
+ };
+ data_ctx.set_segment_section(segment_name, section_name);
+ }
- let bytes = alloc.inspect_with_undef_and_ptr_outside_interpreter(0..alloc.len()).to_vec();
+ let bytes = alloc.inspect_with_uninit_and_ptr_outside_interpreter(0..alloc.len()).to_vec();
data_ctx.define(bytes.into_boxed_slice());
for &(offset, (_tag, reloc)) in alloc.relocations().iter() {
let endianness = tcx.data_layout.endian;
let offset = offset.bytes() as usize;
let ptr_size = tcx.data_layout.pointer_size;
- let bytes = &alloc.inspect_with_undef_and_ptr_outside_interpreter(offset..offset + ptr_size.bytes() as usize);
+ let bytes = &alloc.inspect_with_uninit_and_ptr_outside_interpreter(
+ offset..offset + ptr_size.bytes() as usize,
+ );
read_target_uint(endianness, bytes).unwrap()
};
- // Don't inline `reloc_target_alloc` into the match. That would cause `tcx.alloc_map`
- // to be locked for the duration of the match. `data_id_for_static` however may try
- // to lock `tcx.alloc_map` itself while calculating the layout of the target static.
- // This would cause a panic in single threaded rustc and a deadlock for parallel rustc.
- let reloc_target_alloc = tcx.alloc_map.lock().get(reloc).unwrap();
+ let reloc_target_alloc = tcx.get_global_alloc(reloc).unwrap();
let data_id = match reloc_target_alloc {
GlobalAlloc::Function(instance) => {
assert_eq!(addend, 0);
data_ctx.write_function_addr(offset.bytes() as u32, local_func_id);
continue;
}
- GlobalAlloc::Memory(_) => {
- cx.todo.insert(TodoItem::Alloc(reloc));
- data_id_for_alloc_id(module, reloc, alloc.align)
+ GlobalAlloc::Memory(target_alloc) => {
+ data_id_for_alloc_id(cx, module, reloc, target_alloc.mutability)
}
GlobalAlloc::Static(def_id) => {
+ if tcx.codegen_fn_attrs(def_id).flags.contains(CodegenFnAttrFlags::THREAD_LOCAL)
+ {
+ tcx.sess.fatal(&format!(
+ "Allocation {:?} contains reference to TLS value {:?}",
+ alloc, def_id
+ ));
+ }
+
// Don't push a `TodoItem::Static` here, as it will cause statics used by
// multiple crates to be duplicated between them. It isn't necessary anyway,
// as it will get pushed by `codegen_static` when necessary.
- data_id_for_static(
- tcx,
- module,
- def_id,
- crate::linkage::get_static_ref_linkage(tcx, def_id),
- )
+ data_id_for_static(tcx, module, def_id, false)
}
};
assert!(cx.todo.is_empty(), "{:?}", cx.todo);
}
-fn pop_set<T: Copy + Eq + ::std::hash::Hash>(set: &mut HashSet<T>) -> Option<T> {
- if let Some(elem) = set.iter().next().map(|elem| *elem) {
- set.remove(&elem);
- Some(elem)
- } else {
- None
- }
-}
-
-struct TransPlaceInterpreter;
-
-impl<'mir, 'tcx> Machine<'mir, 'tcx> for TransPlaceInterpreter {
- type MemoryKinds = !;
- type ExtraFnVal = !;
- type PointerTag = ();
- type AllocExtra = ();
- type MemoryExtra = ();
- type FrameExtra = ();
- type MemoryMap = FxHashMap<AllocId, (MemoryKind<!>, Allocation<()>)>;
-
- const CHECK_ALIGN: bool = true;
- const STATIC_KIND: Option<!> = None;
-
- fn enforce_validity(_: &InterpCx<'mir, 'tcx, Self>) -> bool {
- false
- }
-
- fn before_terminator(_: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
- panic!();
- }
-
- fn find_mir_or_eval_fn(
- _: &mut InterpCx<'mir, 'tcx, Self>,
- _: Span,
- _: Instance<'tcx>,
- _: &[OpTy<'tcx>],
- _: Option<(PlaceTy<'tcx>, BasicBlock)>,
- _: Option<BasicBlock>,
- ) -> InterpResult<'tcx, Option<&'mir Body<'tcx>>> {
- panic!();
- }
-
- fn call_intrinsic(
- _: &mut InterpCx<'mir, 'tcx, Self>,
- _: Span,
- _: Instance<'tcx>,
- _: &[OpTy<'tcx>],
- _: Option<(PlaceTy<'tcx>, BasicBlock)>,
- _: Option<BasicBlock>,
- ) -> InterpResult<'tcx> {
- panic!();
- }
-
- fn find_foreign_static(_: TyCtxt<'tcx>, _: DefId) -> InterpResult<'tcx, Cow<'tcx, Allocation>> {
- panic!();
- }
-
- fn binary_ptr_op(
- _: &InterpCx<'mir, 'tcx, Self>,
- _: mir::BinOp,
- _: ImmTy<'tcx>,
- _: ImmTy<'tcx>,
- ) -> InterpResult<'tcx, (Scalar, bool, Ty<'tcx>)> {
- panic!();
- }
-
- fn ptr_to_int(_: &Memory<'mir, 'tcx, Self>, _: Pointer<()>) -> InterpResult<'tcx, u64> {
- panic!();
- }
-
- fn box_alloc(_: &mut InterpCx<'mir, 'tcx, Self>, _: PlaceTy<'tcx>) -> InterpResult<'tcx> {
- panic!();
- }
-
- fn init_allocation_extra<'b>(
- _: &(),
- _: AllocId,
- alloc: Cow<'b, Allocation>,
- _: Option<MemoryKind<!>>,
- ) -> (Cow<'b, Allocation<(), ()>>, ()) {
- (alloc, ())
- }
-
- fn tag_static_base_pointer(_: &(), _: AllocId) -> Self::PointerTag {
- ()
- }
-
- fn call_extra_fn(
- _: &mut InterpCx<'mir, 'tcx, Self>,
- _: !,
- _: &[OpTy<'tcx, ()>],
- _: Option<(PlaceTy<'tcx, ()>, BasicBlock)>,
- _: Option<BasicBlock>,
- ) -> InterpResult<'tcx> {
- unreachable!();
- }
-
- fn stack_push(_: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
- Ok(())
- }
-
- fn stack_pop(_: &mut InterpCx<'mir, 'tcx, Self>, _: (), _: bool) -> InterpResult<'tcx, StackPopInfo> {
- Ok(StackPopInfo::Normal)
- }
-
- fn assert_panic(
- _: &mut InterpCx<'mir, 'tcx, Self>,
- _: Span,
- _: &PanicInfo<Operand<'tcx>>,
- _: Option<BasicBlock>,
- ) -> InterpResult<'tcx> {
- unreachable!()
- }
-}
-
-pub fn mir_operand_get_const_val<'tcx>(
- fx: &FunctionCx<'_, 'tcx, impl Backend>,
+pub(crate) fn mir_operand_get_const_val<'tcx>(
+ fx: &FunctionCx<'_, '_, 'tcx>,
operand: &Operand<'tcx>,
-) -> Option<&'tcx Const<'tcx>> {
- let place = match operand {
- Operand::Copy(place) | Operand::Move(place) => place,
- Operand::Constant(const_) => return Some(force_eval_const(fx, const_.literal)),
- };
-
- assert!(place.projection.is_empty());
- let static_ = match &place.base {
- PlaceBase::Static(static_) => static_,
- PlaceBase::Local(_) => return None,
- };
-
- Some(match &static_.kind {
- StaticKind::Static => unimplemented!(),
- StaticKind::Promoted(promoted, substs) => {
- let instance = Instance::new(static_.def_id, fx.monomorphize(substs));
- fx.tcx.const_eval_promoted(instance, *promoted).unwrap()
+) -> Option<ConstValue<'tcx>> {
+ match operand {
+ Operand::Constant(const_) => match const_.literal {
+ ConstantKind::Ty(const_) => {
+ fx.monomorphize(const_).eval(fx.tcx, ParamEnv::reveal_all()).val.try_to_value()
+ }
+ ConstantKind::Val(val, _) => Some(val),
+ },
+ // FIXME(rust-lang/rust#85105): Casts like `IMM8 as u32` result in the const being stored
+ // inside a temporary before being passed to the intrinsic requiring the const argument.
+ // This code tries to find a single constant defining definition of the referenced local.
+ Operand::Copy(place) | Operand::Move(place) => {
+ if !place.projection.is_empty() {
+ return None;
+ }
+ let mut computed_const_val = None;
+ for bb_data in fx.mir.basic_blocks() {
+ for stmt in &bb_data.statements {
+ match &stmt.kind {
+ StatementKind::Assign(local_and_rvalue) if &local_and_rvalue.0 == place => {
+ match &local_and_rvalue.1 {
+ Rvalue::Cast(CastKind::Misc, operand, ty) => {
+ if computed_const_val.is_some() {
+ return None; // local assigned twice
+ }
+ if !matches!(ty.kind(), ty::Uint(_) | ty::Int(_)) {
+ return None;
+ }
+ let const_val = mir_operand_get_const_val(fx, operand)?;
+ if fx.layout_of(ty).size
+ != const_val.try_to_scalar_int()?.size()
+ {
+ return None;
+ }
+ computed_const_val = Some(const_val);
+ }
+ Rvalue::Use(operand) => {
+ computed_const_val = mir_operand_get_const_val(fx, operand)
+ }
+ _ => return None,
+ }
+ }
+ StatementKind::SetDiscriminant { place: stmt_place, variant_index: _ }
+ if &**stmt_place == place =>
+ {
+ return None;
+ }
+ StatementKind::LlvmInlineAsm(_) | StatementKind::CopyNonOverlapping(_) => {
+ return None;
+ } // conservative handling
+ StatementKind::Assign(_)
+ | StatementKind::FakeRead(_)
+ | StatementKind::SetDiscriminant { .. }
+ | StatementKind::StorageLive(_)
+ | StatementKind::StorageDead(_)
+ | StatementKind::Retag(_, _)
+ | StatementKind::AscribeUserType(_, _)
+ | StatementKind::Coverage(_)
+ | StatementKind::Nop => {}
+ }
+ }
+ match &bb_data.terminator().kind {
+ TerminatorKind::Goto { .. }
+ | TerminatorKind::SwitchInt { .. }
+ | TerminatorKind::Resume
+ | TerminatorKind::Abort
+ | TerminatorKind::Return
+ | TerminatorKind::Unreachable
+ | TerminatorKind::Drop { .. }
+ | TerminatorKind::Assert { .. } => {}
+ TerminatorKind::DropAndReplace { .. }
+ | TerminatorKind::Yield { .. }
+ | TerminatorKind::GeneratorDrop
+ | TerminatorKind::FalseEdge { .. }
+ | TerminatorKind::FalseUnwind { .. } => unreachable!(),
+ TerminatorKind::InlineAsm { .. } => return None,
+ TerminatorKind::Call { destination: Some((call_place, _)), .. }
+ if call_place == place =>
+ {
+ return None;
+ }
+ TerminatorKind::Call { .. } => {}
+ }
+ }
+ computed_const_val
}
- })
+ }
}
projects / rust.git / blobdiff